function xmlwriter_start_dtd(xmlwriter, qualifiedName, publicId, systemId) {
  // http://kevin.vanzonneveld.net
  // +   original by: Brett Zamir (http://brett-zamir.me)
  // *     example 1: var xmlwriter = xmlwriter_open_memory();
  // *     example 1: xmlwriter_start_dtd(xmlwriter, 'html', '-//W3C//DTD XHTML 1.0 Transitional//EN', 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd');
  // *     returns 1: true

  return xmlwriter.startDTD(qualifiedName, publicId, systemId);
}
